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import { useState, useEffect, useRef, useCallback } from 'react';
import { apiRequest } from './queryClient';
import { Message, ChatResponse, ModelInfo } from './types';
// Hook for managing chat state
export function useChat(initialConversationId = "default") {
const [messages, setMessages] = useState<Message[]>([
{
role: "assistant",
content: "Hello! I'm your AI assistant. How can I help you today?"
}
]);
const [isLoading, setIsLoading] = useState(false);
const [error, setError] = useState<string | null>(null);
const [conversationId, setConversationId] = useState(initialConversationId);
const [currentModel, setCurrentModel] = useState<'openai' | 'qwen' | 'unavailable'>('openai');
const [isConnected, setIsConnected] = useState(true);
// Load message history for a conversation
const loadMessages = useCallback(async (convId: string) => {
try {
setIsLoading(true);
setError(null);
const response = await fetch(`/api/conversations/${convId}/messages`, {
credentials: 'include',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
}
});
if (!response.ok) {
if (response.status === 404) {
// If conversation not found, reset to welcome message
setMessages([
{
role: "assistant",
content: "Hello! I'm your AI assistant. How can I help you today?"
}
]);
return;
}
throw new Error('Failed to load message history');
}
const data = await response.json() as Message[];
if (data.length > 0) {
setMessages(data);
} else {
// Reset to welcome message if no messages
setMessages([
{
role: "assistant",
content: "Hello! I'm your AI assistant. How can I help you today?"
}
]);
}
} catch (err: any) {
setError(err.message);
console.error('Error loading messages:', err);
} finally {
setIsLoading(false);
}
}, []);
// Auto-load messages when conversation ID changes
useEffect(() => {
const fetchMessages = async () => {
if (conversationId) {
try {
await loadMessages(conversationId);
} catch (error) {
console.error("Failed to load messages:", error);
}
}
};
fetchMessages();
}, [conversationId]);
// Send a message to the API
const sendMessage = useCallback(async (content: string) => {
if (!content.trim()) return;
try {
setIsLoading(true);
setError(null);
// Add user message to state immediately for UI
const userMessage: Message = {
role: "user",
content
};
setMessages(prev => [...prev, userMessage]);
// Prepare message history for API
// Filter out any messages without content or role
const messageHistory = messages
.filter(msg => msg.content && msg.role)
.map(msg => ({
role: msg.role,
content: msg.content
}));
// Add the new user message
messageHistory.push({
role: userMessage.role,
content: userMessage.content
});
// Make API request
const response = await apiRequest('POST', '/api/chat', {
messages: messageHistory,
conversationId
});
const data = await response.json() as ChatResponse;
// Add the assistant's response to state
setMessages(prev => [...prev, data.message]);
// Update current model if provided
if (data.modelInfo) {
setCurrentModel(data.modelInfo.model);
}
// Auto-refresh message history to sync with server
setTimeout(() => {
loadMessages(conversationId);
}, 1000);
} catch (err: any) {
let errorMessage = err.message || 'Failed to send message';
// Check if it's a quota exceeded error and provide a more friendly message
if (errorMessage.includes('quota exceeded') || errorMessage.includes('insufficient_quota')) {
errorMessage = "The OpenAI API quota has been exceeded. This often happens with free accounts. The system will attempt to use the Qwen fallback model.";
}
setError(errorMessage);
console.error('Error sending message:', err);
} finally {
setIsLoading(false);
}
}, [messages, conversationId, loadMessages]);
// Clear the current conversation
const clearConversation = useCallback(() => {
setMessages([
{
role: "assistant",
content: "Hello! I'm your AI assistant. How can I help you today?"
}
]);
}, []);
// Check connection status
useEffect(() => {
const checkConnection = async () => {
try {
const response = await fetch('/api/health');
setIsConnected(response.ok);
} catch (err) {
setIsConnected(false);
}
};
checkConnection();
const interval = setInterval(checkConnection, 30000);
return () => clearInterval(interval);
}, []);
// Also check model status periodically
useEffect(() => {
const checkModelStatus = async () => {
try {
const response = await fetch('/api/model-status');
if (response.ok) {
const data = await response.json();
setCurrentModel(data.model);
}
} catch (err) {
console.error('Error checking model status:', err);
}
};
checkModelStatus();
const interval = setInterval(checkModelStatus, 5 * 60 * 1000);
return () => clearInterval(interval);
}, []);
return {
messages,
isLoading,
error,
conversationId,
isConnected,
currentModel,
sendMessage,
clearConversation,
loadMessages,
setConversationId
};
}
// Hook to scroll to bottom of chat
export function useScrollToBottom(dependency: any) {
const ref = useRef<HTMLDivElement>(null);
useEffect(() => {
if (ref.current) {
ref.current.scrollTop = ref.current.scrollHeight;
}
}, [dependency]);
return ref;
} |